Interference Rejection; Coupled Frequency - Keysight Technologies C Series User Manual

Fieldfox analyzers

CAT (Cable and Antenna Test) Mode

CAT Mode Settings

Interference Rejection

Use this setting when you suspect that other signals in the area are interfering

with a measurement. Interference may look like a spike or lack of stability in the

measurement trace. While monitoring a measurement at a specific frequency,

toggle this setting between ON and OFF. If the measurement result decreases

while ON, then there is an interfering signal in the area. Continue to make

measurements with Interference Rejection ON. However, this will slow the

measurement speed.

Once enabled, up to SIX sweeps may be required before the interfering signal

is neutralized.

This setting can be changed at any time without affecting calibration accuracy.

How to set Interference Rejection

1. Press Meas Setup 4 >

2. Then choose from the following:

This setting, especially useful for a Return Loss & DTF measurement, allows

both measurements to have different frequency ranges.

How to set Coupled Frequency

With a Return Loss & DTF measurement present:

1. Press Meas Setup 4.

2. Select the DTF measurement (Tr2) using the

3. Then choose from the following:

Interference Rejection [current

No interference rejection and fastest possible sweep speed

The lowest level of Interference rejection.

The medium level of Interference rejection.

The highest level of Interference rejection.

Coupled Freq ON

- Both the Return Loss and DTF traces have the

same frequency range settings.

Coupled Freq OFF

(default setting) - Both traces are allowed to have

individual frequency range settings. When set to OFF:

Keysight N9915-90020 User's Guide